使用Kotlin Android编程语言,可以通过以下步骤来获取CPU使用率:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.GET_TASKS" />
CpuUsageMonitor.kt
的文件,并在该文件中编写以下代码:import java.io.IOException
import java.io.RandomAccessFile
class CpuUsageMonitor {
private var lastTotalCpuTime: Long = 0
private var lastProcessCpuTime: Long = 0
fun getProcessCpuUsage(): Float {
val processCpuTime = getProcessCpuTime()
val totalCpuTime = getTotalCpuTime()
val elapsedTime = processCpuTime - lastProcessCpuTime
val totalElapsedTime = totalCpuTime - lastTotalCpuTime
val cpuUsage = (elapsedTime.toFloat() / totalElapsedTime.toFloat()) * 100
lastProcessCpuTime = processCpuTime
lastTotalCpuTime = totalCpuTime
return cpuUsage
}
private fun getProcessCpuTime(): Long {
val processId = android.os.Process.myPid()
var processCpuTime: Long = 0
try {
val fileReader = RandomAccessFile("/proc/$processId/stat", "r")
val stat = fileReader.readLine()
val stats = stat.split(" ".toRegex()).toTypedArray()
val utime = stats[13].toLong()
val stime = stats[14].toLong()
val cutime = stats[15].toLong()
val cstime = stats[16].toLong()
processCpuTime = utime + stime + cutime + cstime
} catch (e: IOException) {
e.printStackTrace()
}
return processCpuTime
}
private fun getTotalCpuTime(): Long {
var totalCpuTime: Long = 0
try {
val fileReader = RandomAccessFile("/proc/stat", "r")
val stat = fileReader.readLine()
val stats = stat.split(" ".toRegex()).toTypedArray()
val user = stats[2].toLong()
val nice = stats[3].toLong()
val system = stats[4].toLong()
val idle = stats[5].toLong()
totalCpuTime = user + nice + system + idle
} catch (e: IOException) {
e.printStackTrace()
}
return totalCpuTime
}
}
val cpuUsageMonitor = CpuUsageMonitor()
val cpuUsage = cpuUsageMonitor.getProcessCpuUsage()
println("CPU Usage: $cpuUsage%")
这段代码会打印当前应用的CPU使用率。
请注意,这只是一种使用Kotlin Android编程语言获取CPU使用率的方法之一。还有其他方法可以实现相同的功能,具体取决于应用的需求和要求。
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